Images: Virgin Galactic's SpaceShip Two

SpaceShipTwo flies in full feather wing mode on a rapid descent from its drop altitude of 51,500 feet, in this handout photograph taken with high powered telescopes from the ground, over Mojave, California May 4, 2011. Virgin Galactic/Clay Center Observatory/Handout

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The Virgin Galactic SpaceShip2 (VSS Enterprise) glides toward Earth on its first test flight after being released from its WhiteKnight2 mothership (VMS Eve) over the Mojave, California area October 10, 2010. Mark Greenberg-Virgin Galactic/Handout

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Virgin Galactic's SpaceShipTwo is shown on its maiden flight from the Mojave Air and Spaceport in Mojave, California in this publicity photo released to Reuters March 22, 2010. The rocket plane (C), dubbed the VSS Enterprise, is shown attached to the White Knight two carrier airplane. Mark Greenberg/Virgin Galactic/Handout

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The Virgin Galactic SpaceShip2 (VSS Enterprise) glides toward Earth on its first test flight after being released from its WhiteKnight2 mothership (VMS Eve) over the Mojave, California area October 10, 2010. Mark Greenberg-Virgin Galactic/Handout

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A Virgin America A320 (L) flies in tandem with Virgin Galactic's White Knight 2 carrying Spaceship 2 over San Francisco, California in this publicity photo taken and released to Reuters April 6, 2011. Mark Greenberg/Virgin America/Handout

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Entrepreneur Richard Branson and aircraft designer Burt Rutan (not pictured) display a model of SpaceShipTwo spaceship after it was unveiled in New York January 23, 2008. REUTERS/Chip East

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Virgin Galactic's WhiteKnight Two and SpaceShip Two flies over head at the airfield at Spaceport America in Upham, New Mexico as New Mexico Governor Bill Richardson (L) and Sir Richard Branson pose at the runway dedication October 22, 2010 in this publicity photograph released by The New Mexico Spaceport Authority. Jesse Ramirez/The New Mexico Spaceport Authority/Handout

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Virgin Galactic's WhiteKnight Two and SpaceShip Two flies above the hanger facility at Spaceport America in Upham, New Mexico at the runway dedication October 22, 2010 in this publicity photograph released by Virgin Galactic. Jeffrey Vock/Virgin Galactic/Handout

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PICTURE PACKAGE WIRE PHOTO OF THE WEEK 1 - The Virgin Galactic SpaceShip2 (VSS Enterprise) glides toward Earth on its first test flight after being released from its WhiteKnight2 (VMS Eve) mothership over Mojave, California October 10, 2010. Mark Greenberg-Virgin Galactic/Handout

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Virgin Galactic's WhiteKnight Two and SpaceShip Two circle the airfield at Spaceport America in Upham, New Mexico October 22, 2010 in this publicity photograph released by Virgin Galactic. Mark Greenberg/Virgin Galactic/Handout